Update postgres Docker tag to v16

[renovate]

This PR contains the following updates:

Package	Update	Change
postgres	major	13 -> 16

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@2d81a4e). Click here to learn what that means.
Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage        ?   88.43%           
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  Files           ?      275           
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  Branches        ?        0           
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  Hits            ?    24103           
  Misses          ?     3152           
  Partials        ?        0           

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[Turbo87]

We're planning on upgrading our production database within the next couple of weeks. This PR should only get merged once that has happened.